Curling-die for packages.



mgwww A. B. STARR.

CURLING DIE FOR PACKAGES. APPLICATION nuzo NOV- 22, 1912.

Patented Aug. 3, 1915.

ALDEN B. STARR, OF NEW YORK, N. Y., ASSIGNOR TO JOHN MARKI'QE, OF JEDDO,PENNSYLVANIA.

CURLING-DIE FOR PACKAGES..

To all 10h am it may concern:

Be it known that I, ALDEN B. STARR, a citizen of the United States,residing at the city of New York, in the borough of'Manhattan and Stateof New York, have invented certain new and useful Improve ments inCurling-Dies for Packages, of which the following is a full, clear, andexact description.

This invention relates to dies for curling the projecting edge or flangeof a receptacle or package, which surrounds the bottom or closing diskthereof, whereby said edge or flange will'be strengthened and the bottomdisk supported in place.

In the Patent #981,067, granted F ebruary 11, 1911, there is shown a diehaving an annular forming groove in its working face which is protectedfrom wear occasioned by the frictional contact between the rapidlyrotating die and the rough edge of the receptacle, by a series of pinsradially disposed with respect to the axis of the die. These pins havetransverse grooves intermediate their lengths, of the same shape as thegroove in the die, and are positioned in the die-with the walls of theirgrooves alining with the walls of the forming groove, but with thebottom surfaces thereof inclined slightly to the bottom surface of thesaid groove. The pins thus receive the brunt of the wear on the die. Ithas been found, however, that since the wear occurs almost entirely uponthe surface which first comes in contact with the edge of the package,the grooves in the pins become worn after a comparatively few packageshave been acted upon, and in order to prevent the forming groove in thedie from becoming worn and thus rendering the die worthless, it isnecessary to frequently supply an entire new set of pins which must beaccurately machined and adjusted in the die in order to properly curltheedges of the receptacles.

My invention consists in locating the grooves in the ends of the pinsand mounting the pins in the die so that the wear will be in alongitudinal direction with respect to the pins, so that by alongitudinal adjustment of the pins, the Wear is compensated and thepins will last an indefinite time.

In the form illustrated, I have shown a die adapted to be used with atype of bottoming machine disclosed in my applica- Specification ofLetters Patent.

Patented Aug.3,1915.

Serial No. 802,360.

tion Serial N 0. 793,987, filed October 8, 1913,

but the invention is not limited to use with machines such as isdescribed therein, but

is capable of broad application with dies such as are disclosed in thePatent No. 981,067 above. referred to, as well as with other forms ofdies of a similar nature not specifically referred to.

In the drawings, Figure 1 is a plan view of a die embodying myinvention; and Fig. 2 is a central vertical section of the die throughthe pins, :1 part of one of the pins being removed to. show th groove inthe die. The die 1 consists of a block of steel or other suitablematerial having a threaded socket 2 in its upper face and a cylindricalrecess 3 in its lower face, the socket and recess being connected by acircular opening of less diameter than either, providing an annularflange 4 against which the shaft Y5 (not shown) which carries the die,bears. An annular groove 5 is formed in the bottom and at the peripheryof the cylindrical recess 3 into which the edge of the package isreceived in order that it may be curled or crimped thereby. 1

Extending from the top surface of the die to the groove 5 are aplurality of cylindrical recesses 7 which are of slightly greaterdiameter than the width of this groove, and, as shown, are preferablyarranged parallel to the axis'of the die with a portion of each recesslocated on each side of the groove. Pins 8 of hardened steel havingdepending portions 9 projecting proper position in the die; that is, theface 11 is arranged so that the inner surface of the depending portion 9of the pin, will be substantially flush and even with the cylindricalsurface of the recess 3 and the surface of the groove 10 in the pin,alining with 3% the surface of the groove 5. In the preferredconstruction, however, the pins are arranged with the bottoms of theirgrooves projecting slightly beyond the bottom of the groove '5. Toprevent the tearing of the no Y edge of the receptacle, by the sharpedges of the pins, I find it desirable to bevel the edges of thesurfaces of the depending portion 9 and of the groove 10.

If we assume that a die of this character is being rotated rapidly andis brought down over the edge of the receptacle, said edge will firstcontact with the cylindrical surface of the recess 3, and thecorresponding surfaces on the depending portions 9, thelatter'preventing undue wear of these surfaces. \Vhen the die is presseddown upon the edge of the package, the pressure necessary to curl thisedge is relatively great, and the wear which would occur on the groove 5due to the cutting action occasioned by the frictional contact betweenthe rough edges of the package and the walls of the groove 5, will occuron the pins since they project slightly beyond the surface of the groovein the die. These pins being of hardened steel will better withstandthis cutting action and as the shape of the grooves in the pinscorresponds to that of the groove in the die, the edge of the packagewill be properly curled inwardly.

When the grooves in the pins become worn, it is apparent that by merelyloosening the set-screws, the pins can be advanced to again bring thesurface of their grooves so that they will project slightly beyond thesurface of the groove in the die and thus avoid the necessity forreplacing the pins each time they are worn.

While I have described my invention with the surfaces of the groove 10in the pins projecting slightly beyond the surface of the groove 5 inthe die, yet the amount which the pins project is necessarily small andI deem the term substantially which is used in the claims annexed heretoto be sufficiently broad to cover this construction, as well as one inwhich the surface of the grooves in the pins and die are flush.

Having described my invention, I claim:

1. A rotary die provided with a circular groove arranged in a planetransverse to the axis of rotation and carrying a series ofwear-resisting bodies exposed in said groove, said bodies being rigidlymounted in said die in fixed relation to said groove and adjustable, ina direction parallel to the axis of rotation to expose fresh portions ofthe wear-resisting bodies when wornfrom the curling operation.

2. A rotary die provided with a circular groove arranged in a planetransverse to the axis of rotation and. carrying a series ofwear-resisting bodies exposed in said groove, said bodies being rigidlymounted in said die in fixed relation to said groove and adjustable in adirection parallel to the axis of rotation to expose fresh portions ofthe wear-resisting bodies when worn from the curling operation, theexposed portions of said bodies being shaped to conform to the- 4. Thecombination with a curling die having an annular groove in one facethereof, of a plurality of pins in said die having grooves in the endsthereof corresponding in shape to the groove in the die, said pins beingadjustable in a direction substantially parallel to the axis of rotationof the die..

5. The combination with a curling die having an annular groove in oneface thereof, of a plurality of pins in said die having grooves in theend faces thereof corresponding in shape to the groove in the die andarranged substantially flush therewith, and means for adjusting theposition of said pins within said die When they become worn from thecurling operation.

6. The combination with a curling die havin a cylindricalrecess in'oneface thereof an an annular groove in the face of said recess, thesurface of said groove and the curved surface of said recess beingcontiguous, of a pin in said die having a groove in the end face thereofand a member depending from said end face having a surface contiguouswith the surface of said groove, and means for positioning said pin insaid die with the above-named surfaces of' the pin substantially flushwith the above-namedsurfaces of said die.

In witness whereof, I subscribe my signature, in the presence of twowitnesses.

- ALDEN B. STARR.

Witnesses:

WALDO M. CHAPIN, REUBEN Lonnn.

